Lysianella, G. O. Sars, 1883

Lowry, J. K. & Kilgallen, N. M., 2014, New tryphosine amphipods from Australian waters (Crustacea, Amphipoda, Lysianassoidea, Lysianassidae, Tryphosinae), Zootaxa 3844 (1), pp. 1-64 : 11-14

publication ID

https://doi.org/ 10.11646/zootaxa.3844.1.1

publication LSID

lsid:zoobank.org:pub:10B3C1CE-6279-4B4C-8139-C5D3EDB24255

DOI

https://doi.org/10.5281/zenodo.5116760

persistent identifier

https://treatment.plazi.org/id/3462395F-AB0E-FF8B-6688-FC19F9D6F9E4

treatment provided by

Felipe

scientific name

Lysianella
status

 

Lysianella View in CoL lui sp. nov.

( Figs 6–8 View FIGURE 6 View FIGURE 7 View FIGURE 8 )

Types. Holotype, female, 4.8 mm, NMV J67536 View Materials , 54 About NMV km east-south-east of Nowra , New South Wales, Australia (34°52.72'S 151°15.04'E), 996 m, mud, fine sand, fine shell, WHOI epibenthic sled, 22 October 1988, G.C.B. Poore et al., RV Franklin, SLOPE stn 53 GoogleMaps . Paratypes: 6 specimens, 3.7–4.3 mm, NMV J67537 View Materials , same collection details as holotype .

Additional material examined. 1 specimen, NMV J67538 View Materials , off Nowra , New South Wales, Australia (34°52.29'S 151°15.02'E), 1096 m, shell, WHOI epibenthic sled, 15 July 1986, coll. G.C.B. Poore and C.C. Lu, RV Franklin SLOPE stn 7 GoogleMaps ; 1 specimen, NMV J14608 View Materials , south of Point Hicks , Victoria, Australia (38°25.90'S 148°58.60'E), 1850 m, muddy, sandstone, WHOI epibenthic sled, 22 July 1986, G.C.B. Poore et al., RV Franklin SLOPE stn 25; GoogleMaps 2 specimens, NMV J67539 View Materials , off Freycinet Peninsula , Tasmania, Australia (42°2.20 'S 148°38.70'E), 800 m, coarse shelly sand, WHOI epibenthic sled, 27 July 1986, M.F. Gomon et al., RV Franklin, SLOPE stn 45; GoogleMaps 1 specimen, NMV J7659 About NMV , Eastern Bass Strait , 112 km south-south-east of Cape Conran, Victoria, Australia (38º49.0’S 149º00.9’E), 2450 m, mud, pipe dredge, 16 November 1981, coll. R. Wilson , RV Tangaroa stn BSS Q-636 GoogleMaps .

Type Locality. 54 km east-south-east of Nowra   GoogleMaps , New South Wales, Australia (34°52.72'S 151°15.04'E), 996 m depth.

Etymology. Named for Chung-Cheng Lu, one of the collectors of this species.

Description. Based on holotype female, 4.8 mm, NMV J67536 View Materials . Head lateral cephalic lobe subtriangular, apically subacute; eyes apparently absent. Antenna 1 accessory flagellum forming operculum partially covering callynophore, 3-articulate; primary flagellum with weak 2-field callynophore, robust setae absent from proximal articles; calceoli absent. Antenna 2 peduncular article 3 short; article 4 enlarged; flagellum short, calceoli absent. Labrum, epistome and upper lip separate; epistome less produced than upper lip, concave; upper lip produced, subacute apically. Mandible molar with reduced column and reduced triturating surface; palp attached about midway. Maxilla 1 outer plate setal-tooth 7 present, left and right symmetrical, cuspidate distally; palp distal margin with apical robust setae. Maxilliped outer plate with 2 short apical robust setae; palp article 4 poorly developed.

Pereonites 1–7 dorsally smooth. Gnathopod 1 weakly subchelate; coxa large, about as long as coxa 2, subrectangular with straight anterior margin; basis sparsely setose along anterior margin; ischium short; carpus short, subequal in length to or slightly shorter than propodus, without posterior lobe; propodus small, margins slightly tapering distally, sparsely setose along posterior margin, palm strongly acute, entire, straight. Gnathopod 2 minutely chelate; propodus palm moderately obtuse. Pereopod 4 coxa with a well-developed posteroventral lobe. Pereopod 5 basis about as long as broad, posteroproximally excavate, posterior margin not serrate. Pereopod 7 basis posterodistally less than halfway along merus.

Pleonite 3 without mid-dorsal carina, posterodorsal margin produced, truncated. Epimeron 3 posterior margin smooth, posteroventral corner subacute. Urosomite 1 dorsally straight. Uropod 2 inner ramus without constriction. Uropod 3 inner and outer rami well developed, outer ramus article 2 long, without plumose setae on rami. Telson apically notched , longer than wide, with 6–8 dorsal robust setae and 2 apical robust setae.

Sexually dimorphic characters. Not known.

Remarks. Lysianella lui is very similar to Lysianella mimica (J.L. Barnard, 1962) . The most outstanding difference between these species is the maxilliped palp article 4 which is reduced and blunt in L. lui sp. nov., but well-developed in L. mimica . Lysianasella lui is also similar to L. morbihanensis ( Bellan-Santini & Ledoyer, 1974) from the Kerguelen Islands, but the latter species apparently lacks a fourth article on the maxilliped palp, and the posteroventral lobe on pereopod 4 is not as strongly developed as in L. lui. Lysianella lui is the only species in the genus with no constriction on uropod 2, otherwise diagnostic for the genus.

Depth range. 800–2450 m.

Distribution. Australia. Eastern and south-eastern coasts, from Nowra, New South Wales to the Freycinet Peninsula, Tasmania.

NMV

Museum Victoria

WHOI

Woods Hole Oceanographic Institution

RV

Collection of Leptospira Strains

R

Departamento de Geologia, Universidad de Chile

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